I'm running an integrated copy, and am having no issues at all with it. Granted, my 'programs and features' isn't quite full, but I'm having a much better experience with this than I did with build 7100 of win7.

Granted, I may run into problems as more apps are installed, but so far so good.

IE 8 seems to be a huge culprit. But the MS installer has just crapped out on me many times while installing applications.